Thirty people are selected for a long-term mission to colonize a planet many light-years away from Earth. The mission is successful, and the population rapidly grows to several hundred individuals. However, certain genetic diseases are unusually common
in this group, and the group's gene pool is quite different from that of the Earth population they have left behind. Which of the following phenomena has left its mark on this population?
A) founder effect
B) bottleneck effect
C) high rates of mutation
D) natural selection
Answer: A
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By 3.2 billion years ago, chemosynthetic cells had
become established a. near deep-sea hydrothermal vents. b. in salt lakes. c. in hot, highly acidic, fresh-water springs. d. in deep oceanic sediments. e. in the upper sunlit waters of the open oceans.
In the human life cycle, somatic cells are diploid and gametes are haploid
a. true b. false
Choose the best definition of the term "ecology."
A. Ecology is the study of communities of organisms. B. Ecology is the study of plants and animals in their ecosystems. C. Ecology is the study of animals in their habitat. D. Ecology is the study of interactions of organisms with each other and with their habitat.
The light reactions of photosynthesis, which form ATP and NADPH, take place in the ________.
A. nucleus B. stroma C. cytoplasm D. thylakoid membrane